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__clone.S revision 1.2 
      1 /*	$NetBSD: __clone.S,v 1.2 2014/08/23 02:24:22 matt Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2001 Tsubai Masanari.  All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. The name of the author may not be used to endorse or promote products
     15  *    derived from this software without specific prior written permission.
     16  *
     17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     26  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/errno.h>
     30 #include "SYS.h"
     31 
     32 #ifdef WEAK_ALIAS
     33 WEAK_ALIAS(clone, __clone)
     34 #endif
     35 
     36 /*
     37  * int __clone(int (*fn)(void *), void *stack, int flags, void *arg);
     38  */
     39 ENTRY(__clone)
     40 	/*
     41 	 * Sanity checks: func and stack may not be NULL.
     42 	 */
     43 	cmpptri	%r3,0
     44 	beq	1f
     45 	cmpptri	%r4,0
     46 	beq	1f
     47 
     48 	mr	%r7,%r3		/* Save fn in r7. */
     49 	mr	%r3,%r5
     50 	_DOSYSCALL(__clone)	/* (flags, stack) */
     51 	bso	2f		/* error... */
     52 
     53 	cmpptri	%r3,0
     54 	bnelr			/* We're the parent, just return. */
     55 
     56 	mtlr	%r7		/* fn */
     57 	mr	%r3,%r6		/* arg */
     58 	blrl			/* Call the clone's entry point. */
     59 
     60 	bl	PIC_PLT(_C_LABEL(_exit))
     61 	nop
     62 
     63 1:
     64 	li	%r3,EINVAL
     65 2:
     66 	BRANCH_TO_CERROR()
     67 END(__clone)
     68